Order flow basics: the beginner course
Order flow on one page
Order flow is the set of orders arriving on the market: those that wait in the book at a given price, and those that execute immediately against them. The price you see on a chart is only the result of that encounter. Order flow is interested in the cause: who bought, who sold, with what urgency, and where.
Think of an auction. The auctioneer announces a price. If there are more buyers in a hurry than sellers ready to give way, the price rises until it finds new sellers. If nobody is left to outbid, it falls back. A futures market works exactly like that, thousands of times per second. The candlestick chart gives you the price of each strike of the hammer; order flow shows you the room.
The three questions of every read
- Who is waiting? Passive orders (limit orders), resting in the book. They form liquidity zones: brakes, sometimes walls. You read them on the DOM and on the heatmap.
- Who is acting? Aggressive orders (market orders), which consume liquidity. They are what moves price. You read them in volume, delta, the footprint and the execution bubbles.
- Who wins? Price decides. If aggression gets through the liquidity, the move continues. If the liquidity absorbs everything without giving way, the move stops. The whole read comes down to that confrontation.
The four reading layers the course builds one by one: the order book at moment T, the heatmap that keeps its memory, the executions that test it, then confirmation by the cumulative delta, the VWAP and the profiles.
Why it works on futures
A futures contract like ES trades on a single centralized market, the CME Globex in Chicago. There is only one order book, and every transaction goes through it. The result: the data you receive is complete. You see all the volume, all the depth, every execution. On spot forex, by contrast, the market is split among hundreds of banks and brokers: the “volume” you are shown there is only a sample. That is why order flow is practiced mostly on futures, and why this course deals with them exclusively.
What order flow is not
- Not a crystal ball. It does not predict tomorrow's price. It shows, here and now, which side is getting the upper hand at a precise level.
- Not a magic indicator. A footprint does not give a buy signal. It gives clues, which you put together.
- Not a separate method. It is a magnifying glass. It helps you make better decisions at the places that matter: the previous day's high, a value area, a big wall. In the middle of nowhere, the best read in the world is worth nothing.
The basic vocabulary, one line each
| Term | Meaning |
|---|---|
| Order book | The list of resting limit orders, sorted by price |
| Bid / Ask | The best buying price / the best selling price |
| Aggressive | A market order, executed right away, that “crosses” the spread |
| Passive | A limit order, which waits for an aggressive order to come and take it |
| Volume | The number of contracts traded |
| Delta | Aggressive buys minus aggressive sells |
| Footprint | The candle opened price by price, with buying and selling volume detailed |
| Heatmap | The memory of the order book: where liquidity waited, and for how long |
You do not need to remember everything now. Each term has its own lesson.
End of the free lesson
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